Combined chuck and brake mechanism



F.R.LONG

May 13, 1930.

COMBINED CHUCK AND BRAKE MECHANTSM Filed June 4. 1929 2 Sheets-Sheet 1 Fiflliori F. R. LONG May 13, 1930.

COMBINED CHUCK AND BRAKE MECHANISM Filed June 4. 1929 2 Sheets-Sheet Zlwuentoo IIII Illlllllllllllllllll Patented ll iay is, was i I 1 75s 34 I 7 a nniran sraresearsrr easier.

FIR-ED R. LONG, F CATAWISSA, PENNSYLVANIA COMBINED CHUCK AND BRAKE MECHANISM Application filed June 4, 1929. Serial No. 388,279.

This invention relates to a combined chuck chuck to enable a machine operation to be and brake mechanism, and has for its general performed thereon; and object to provide means, capable of general Fig. 7 is an end view of the object shown application, whereby movement of a control in Fig. 6.

member to one position releases the brake Referring to the drawings in detail, A 55 and applies the chuck, and to another posidesignates a hollow spindle carrying at one tion applies the brake and releases the chuck. end a chuck, designated generally at B, and I More particularly it is the purpose of the provided at another point with one or more present invention to provide a simple, ineX- bell crank levers C,the short arms 10 of which 10 pensive, reliable and eiiicient mechanism for extend into the interior of said spindle and 60 incorporation in a screw machine to arrest the long arms 11 of which are disposed conrotation of a chuck carrying spindle and to tiguous to the outer face of said spindle. simultaneously release the chuck, or, vice- Slidable on the spindle A is a collar 12, proversa, to actuate the chuck into holding envided with a stepped, generally conical porgagement with an object and to siinultanetion 13 for cooperation with the long arms 65 ously release the chuck spindle for rotation, of the bell-crank levers C, and also provided all with a view to enabling maximum producwith an annular groove 14 to receive the fork tion in a minimum amount of time and with arms 15 of a collar shifting member 16, minimum effort on the part of the person opwhich latter is mounted for sliding movement crating the machine. on a rod 17 supported in any suitable manner 70 Also the invention has in view to provide, parallel to the spindle A. in a starting and stopping mechanism as set Formed either integrally with the spindle forth, means for stopping the chuck in a pre- A, or separate therefrom and fixed thereto determined position of rotation to facilitate in any desired manner is a boss or collar 18 engagement. th with f an object to beheld which is inclusive of an annular portion 19 75 thereby. tapered in the direction of the collar 12 and With the foregoing and other objects in provided with one or more longitudinally view, the invention consists in the novel feaextending grooves or recesses 20.

tures of construction, combination and ar- The chuck B may be of any preferred type rangement of parts as will be hereinafter and construction which is inclusive of grip- 80 more fully described, illustrated in the acping jaws which are effective, when moved companying drawings and defined in the aplongitudinally outward, to contract upon and pended claims. grip an object disposed between them. In the In the drawings, wherein like characters of presentinstancesaid chuck consists of a hollow reference denote corresponding parts in the body 21 having arranged therein for longi- 85 different views tudinal movement a plurality of jaws 22. A Fig. 1 is a side elevation of mechanism concap member 23 is threaded on the body 21 structed in accordance with the invention, iland this cap member and the jaws 22 are prolustrating the relative position of the parts vided with cooperating inclined or wedge when the chuck is engaged with an object and surfaces 24 so arranged that by moving the 90 the chuck spindle is released. jaws outward relative to the cap member said Fig. 2 is a view similar to Fig. 1 showing jaws are contracted, that is, moved radially the relative position of the parts of the mechinwardly towards one another so as to grip an anism when the chuck is released and the object disposed between them.

brake is applied. Mounted in any suitable manner for longi- Fig. 3 is a section on the line 33 of Fig. 1. tudinal sliding movement within the spindle Fig. 4 is a section on the line 4-4 of Fig, 1. A is a push rod 25, one end of which is ar- Fig. 5 is an end view of the chuck. ranged to cooperate in any suitable manner Fig. 6 is a side elevation of an object which with the inner ends of the chuck jaws 22 to is adapted to be held and rotated by the impart outward movement to said jaws. 011

nipulation by the operator of .necting this arm with said rod is a flange 26, ment by the levers C.

Secured to the shift member 16 is a brake element 27 in the form of a plate having an end portion 28 thereof bent inwardly toward the spindle Aand then extended laterally as indicated at 29 in Fig. 3 of the drawings for cooperation with the member 18. Slots 30 are formed in said plate to receive the screws 31 employed to secure said plate to the shift member 16 whereby said plate may be adjusted relative to the member 18, and, for a purpose which will presently appear, the portion 29 of said plate, which preferably is resilient, is provided with an inwardly directed protuberance 32 and faced with suitable friction material 33.

Mounted on a shaft 34 for arcuate swinging movement is a control member in the form of a lever 35, positioned for convenient mathe machine in which the foregoing mechanism is embodied. On the shaft 34 is fixed an arm 36, and conthe shift member 16 is disposed for engageshort arms of the bell-crank a link 37.

As aforesaid, the collar 12 is adapted for cooperation with the bell-crank levers C and the portion 29 of the plate 27 is adapted for cooperation with the member 18. When the collar 12 is shifted to the left from the position of Fig. 2 to the position of Fig. l the stepped portion 13 thereof is adapted to engage the long arms 11 ofthe bell-crank levers C and swing them outward. On the other hand, when the shift member is moved to the right from the position of Fig. 1 to the position of Fig. 2, the collar 12 not only is adapted to be moved free of the bell-erank arms 11 to permit same to swing inward, but the portion 29 of the plate 27 is adapted to be engaged with the portion 19 of the member 18. To this end it will be observed that the parts referred to are so spaced that when the shift member 16 is moved to the right from the position of Fig. 1 the collar 12 becomes disengaged from the bell-crank arms 11 before the portion 29 of the plate 27 engages the face 19 of the member 13, engagement of the portions 29 and 19 occurring immediately following disengagement of said collar from said bell-crank arms. The adjustment forded by the slots enables this operation (lily to be predetermined.

The spindle A is adapted to be driven, i. e, rotated in any desired manner. For example, it may be directly driven by an electric motor, or indirectly by gears or by a belt. Thus, assuming the power to be cut off from said spindle and theparts of the mechanism to be in their positions shown in Fig. 2 of the draw ings, the operation is apparent and as follows:

An object to be operated upon is engaged between the chuck aws 22 and the lever is swung to the left, bringing the parts of the mechanism into the relation shown in Fig. 1. That is, the shift member 16 is moved to the left along its supporting or guide rod 17 and the portion 29 of the plate 27 is disengaged from the member 18 and the portion 13 of the collar v12 .is moved between the bellcrank arms 11, forcing them outward. As said arms 11 are forced outward the short arms 10 as a consequence press forcibly against the flange 26 and push the rod 25 to the right as viewed in the drawings. This results in'the chuck jaws 22 being pushed to the right with consequent cooperation of the inclined faces'24 "to contract said jaws into clamping engagement with anobject positioned therebetween. Thus, the spindle is free to be rotated and the ob'ect is clamped securely by the chuck for rotation with the spindle Power may thenbeapplied to the spindle to rotate same overany desired period oftime to enable a desired operation to be performed on the object gripped :by the chuck. Upon completion ofthe operation ,on the object, poweris cut off from the spindle and the lever 35 may immediately be swung to the right as viewed inthedrawings. This results, first, in withdrawing the collar 12 from engagementwith the bell-crank arms 11 to enable the push rod to move tothe left and thus remove the clamping pressure of the jaws 22 from the object held therebetween. Immediately following, the friction material 33 on the portion 29 of thep'late 27 engages the face 19 of the member .18 and brakes the spindle A, the resiliency of the portion 29 serving to compensateto a considerable extent for varyingpressures exerted upon the lever 35 so that although the spindle A may be brought to a relatively quick stop,

it is difficult if not impossible so to ,jam the brake as to bring the spindle to such a sudden or harsh stop as possibly to harm the mechanism. Theresiliency of the plate portion .29 moreover, serves the .more important purpose of projecting the protuberance into one of the grooves or recesses 20 whenrotation of the spindle is about to cease, thus stopping the spindle in a predetermined position ofrotation. This is important for this reason: Some articles such, for example, as the pipe union element 38 illustrated in Figs. 6 and 7 of the drawings, are formed withilongitudinally extending ribs 39. One of the particular purposes of the present mechanism is to spin such elements to effect threading thereof by suitable dies (not shown), and to facilitate engagement of such articles between the chuck aws 22 with the ribs 39 disposed within the spaces 40 between adjacent jaws, it is desirable that the chuck should alwaysbe stopped with the jaws 22 in a predeterminedposition of rotation so that the operator may know exactly how to hold the-element 38 to aline the ribs 39 with the spaces 40. The jaws 22 and the spaces therebetween correspond in number to the number of ribs 39 on the elements 38. Said ribs and said spaces are evenly spaced circumferentially, and the grooves or recesses 20 correspond in number to the spaces between the jaws 22, and are respectively alined with said spaces. Thus, regardless of which groove 20 is engaged by the protuberance 32 the chuck al ways will be stopped in a predetermined position of rotation such that the operator, without looking at the chuck, may know exactly in what position to hold an element such as the element 38 to enable same to be inserted into the chuck.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention and scope of the appended claims.

I claim:

1. In mechanism of the class described, a spindle, a chuck and a brake element carried by said spindle, a chuck actuator slidable on said spindle, ashift member for sliding said chuck actuator, and a brake element movable in unison with said shift member for cooperation with said spindle carried brake element.

2. In mechanism of the class described, a spindle, a chuck and a brake element carried by said spindle, a chuck actuating collar shiftable on said spindle, a shift member for sliding said collar, a brake element carried by said shift member for cooperation with said spindle carried brake element, and means connecting said second mentioned brake element to said shift member for adjustment relative thereto.

8. In mechanism of the class described, a spindle, a chuck carried thereby inclusive of a plurality of gripping jaws, a brake element carried by said spindle inclusive of a plurality of recesses corresponding in number to the number of said gripping jaws and disposed in predetermined relation to said jaws respectively, and a second cooperating brake element having a protuberance for engagement in one of said recesses.

4:. In mechanism of the class described a ispindle, a chuck carried thereby inclusive of a plurality of gripping jaws, a brake element on said spindle, a cooperating brake element, positive stop formations on said spindle carried brake element disposed in predetermined relation to said gripping jaws, and a cooperating positive stop formation on said second mentioned brake element.

In testimony whereof I hereunto affix my signature.

FRED R. LONG. 

